Question
Download Solution PDFWhich of the following statements is/are true?
1. Superconductors have almost zero resistivity
2. The external magnetic field has no effect on superconductors
3. Barium Ferrite can't be used for permanent magnets
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFStatement 1:
- Large energy would be required to scatter a huge number of electrons so lattice ions are not able to scatter the electrons and hence due to this resistivity drops to zero.
- So Resistivity of superconductors is zero for temperatures below Tc.
Statement 2: Effect of Magnetic Filed on Super-Conductor:
- Diamagnetics have a magnetization that opposes any applied magnetic field, the superconductor is repelled by the magnetic field.
- When a magnet is placed above a superconductor, this repelling force can be stronger than gravity, allowing the magnet to levitate above the superconductor.
Statement 3: Barium Ferrite:
- Barium ferrite is a highly magnetic material, has a high packing density, and is a metal oxide.
- Barium ferrite is used in applications such as recording media, permanent magnets, and magnetic stripe cards
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